BODILESS SHIFTED GATE WITH CURVILINEAR TRAJECTORY OF MOTION Russian patent published in 2003 - IPC

FIELD: shut-off fittings; shutting-off air ducts and vacuum lines. SUBSTANCE: proposed gate includes seat with hole and motion drive with bellows whose immovable plug may be connected with pressure source. Movable plug is provided with shut-off member. Bellows is non-axisymmetrical; it consists of two parts; in compressed state, centers of inner circumferences of bellows corrugations of one part and centers of inner circumferences of corrugations of other part are shifted to opposite sides relative to axis running through centers of outer circumferences of both parts. EFFECT: simplified construction; reduced usage of materials. 2 cl, 3 dwg